| 摘要 |
<p>A bicycle sprocket is provided that has a synthetic resin fastening part 72c, 91, to facilitate weight saving and prevent the reduction of fastening power (strength) due to deterioration or deformation of the synthetic resin. The sprocket includes a sprocket ring part 72, 90 and a synthetic resin fastening part 72c, 91. The sprocket ring part 72, 90 includes an inner periphery and an outer periphery with a plurality of sprocket teeth 72a, 90a arranged on the outer periphery. The sprocket ring part 72, 90 extends around a central rotation axis. The fastening part 72c, 91 is non-movably coupled to the sprocket ring part 72, 90 at a location radially inwardly of the sprocket teeth 72a, 90a relative to the rotation axis. The fastening part 72c, 91 includes at least one through hole with a metallic tubular member 92 mounted therein and configured to be fixedly coupled to a rotational drive unit of a bicycle. The tubular member 92 has a first fastener contact surface 92c configured to receive a fastening force.</p> |
